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Title: Dynamic Simulation of Shipping Package Subjected to Torque Load and Sequential Impacts

Abstract

A numerical technique has been developed to simulate the structural responses of radioactive material packaging components requiring closure-tightening torque to the scenarios of the hypothetical accident conditions (HAC) defined in the Code of Federal Regulations Title 10 part 71 (10CFR 71). A rigorous solution to this type of problem poses a considerable mathematical challenge. Conventional methods for evaluating the residue stresses due to the torque load are either inaccurate or not applicable to dynamic analyses. In addition, the HAC events occur sequentially and the cumulative damage to the package needs to be evaluated. Commonly, individual HAC events are analyzed separately and the cumulative damage is not addressed. As a result, strict compliance of the package with the requirements specified in 10CFR 71 is usually demonstrated by physical testing. The proposed technique utilizes the combination of kinematic constraints, rigid-body motions and structural deformations to overcome some of the difficulties encountered in modeling the effect of cumulative damage in numerical solutions. The analyses demonstrating use of this technique were performed to determine the cumulative damage of torque preload, a 30-foot drop, a 30-foot dynamic crush and a 40-inch free fall onto a mild steel pipe.

Authors:
Publication Date:
Research Org.:
SRS
Sponsoring Org.:
USDOE
OSTI Identifier:
890060
Report Number(s):
WSRC-MS-2006-00203
TRN: US200620%%692
DOE Contract Number:
DE-AC09-96SR1850
Resource Type:
Journal Article
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACCIDENTS; COMPLIANCE; NUMERICAL SOLUTION; PACKAGING; RADIOACTIVE MATERIALS; REGULATIONS; RESIDUES; SIMULATION; STEELS; STRESSES; TESTING; TORQUE

Citation Formats

Wu, T. Dynamic Simulation of Shipping Package Subjected to Torque Load and Sequential Impacts. United States: N. p., 2006. Web. doi:10.1115/PVP2006-ICPVT-11-93326.
Wu, T. Dynamic Simulation of Shipping Package Subjected to Torque Load and Sequential Impacts. United States. doi:10.1115/PVP2006-ICPVT-11-93326.
Wu, T. 2006. "Dynamic Simulation of Shipping Package Subjected to Torque Load and Sequential Impacts". United States. doi:10.1115/PVP2006-ICPVT-11-93326. https://www.osti.gov/servlets/purl/890060.
@article{osti_890060,
title = {Dynamic Simulation of Shipping Package Subjected to Torque Load and Sequential Impacts},
author = {Wu, T},
abstractNote = {A numerical technique has been developed to simulate the structural responses of radioactive material packaging components requiring closure-tightening torque to the scenarios of the hypothetical accident conditions (HAC) defined in the Code of Federal Regulations Title 10 part 71 (10CFR 71). A rigorous solution to this type of problem poses a considerable mathematical challenge. Conventional methods for evaluating the residue stresses due to the torque load are either inaccurate or not applicable to dynamic analyses. In addition, the HAC events occur sequentially and the cumulative damage to the package needs to be evaluated. Commonly, individual HAC events are analyzed separately and the cumulative damage is not addressed. As a result, strict compliance of the package with the requirements specified in 10CFR 71 is usually demonstrated by physical testing. The proposed technique utilizes the combination of kinematic constraints, rigid-body motions and structural deformations to overcome some of the difficulties encountered in modeling the effect of cumulative damage in numerical solutions. The analyses demonstrating use of this technique were performed to determine the cumulative damage of torque preload, a 30-foot drop, a 30-foot dynamic crush and a 40-inch free fall onto a mild steel pipe.},
doi = {10.1115/PVP2006-ICPVT-11-93326},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2006,
month = 4
}
  • This paper presents a finite-element technique to simulate the structural responses and to evaluate the cumulative damage of a radioactive material packaging requiring bolt closure-tightening torque and subjected to the scenarios of the Hypothetical Accident Conditions (HAC) defined in the Code of Federal Regulations Title 10 part 71 (10CFR71). Existing finite-element methods for modeling closure stresses from bolt pre-load are not readily adaptable to dynamic analyses. The HAC events are required to occur sequentially per 10CFR71 and thus the evaluation of the cumulative damage is desirable. Generally, each HAC event is analyzed separately and the cumulative damage is partially addressedmore » by superposition. This results in relying on additional physical testing to comply with 10CFR71 requirements for assessment of cumulative damage. The proposed technique utilizes the combination of kinematic constraints, rigid-body motions and structural deformations to overcome some of the difficulties encountered in modeling the effect of cumulative damage. This methodology provides improved numerical solutions in compliance with the 10CFR71 requirements for sequential HAC tests. Analyses were performed for the Bulk Tritium Shipping Package (BTSP) designed by Savannah River National Laboratory to demonstrate the applications of the technique. The methodology proposed simulates the closure bolt torque preload followed by the sequential HAC events, the 30-foot drop and the 30-foot dynamic crush. The analytical results will be compared to the package test data.« less
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